There are very low barriers to entry in teaching, and especially in the case of ELT. I’m sure many of us started out our lives as teachers with little more than a solid implicit grasp of the language we teach. Maybe, if we were lucky, we had a bit of input from a shoddy teacher training courses, and those among us that were particularly wealthy, or were required to in order to work in the country that they intended to live, paid for a 20 day intensive CELTA or equivalent up fron.